CN101409583B - Method and device for transmitting signal - Google Patents
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- CN101409583B CN101409583B CN2007101757589A CN200710175758A CN101409583B CN 101409583 B CN101409583 B CN 101409583B CN 2007101757589 A CN2007101757589 A CN 2007101757589A CN 200710175758 A CN200710175758 A CN 200710175758A CN 101409583 B CN101409583 B CN 101409583B
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- 230000011664 signaling Effects 0.000 claims description 7
- 238000004891 communication Methods 0.000 abstract description 11
- 230000008054 signal transmission Effects 0.000 abstract 1
- 238000013507 mapping Methods 0.000 description 18
- 238000010586 diagram Methods 0.000 description 12
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
- H04L27/2613—Structure of the reference signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
- H04L27/2613—Structure of the reference signals
- H04L27/26132—Structure of the reference signals using repetition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0016—Time-frequency-code
Abstract
The invention discloses a method for sending signals, comprising: weighting repetitive extension is carried out on the data symbols to be sent, and the extensional data symbols of the data symbols are obtained; the extensional data symbols and pilot frequency symbols of the data symbols are modulated and mapped to the specified position of time frequency in the corresponding repeating resource blocks, and the corresponding repeating data cell blocks are obtained; the repeating data cell blocks are transmitted. In the method, different repeating data cell blocks can be obtained by carrying out the distinguishing weighting repetitive extension on the data of the user. The repeating data cell blocks can be separated according to the different situations of the weighting repetitive extension, thereby reducing the interference among the users in the adjacent cells and improving the communication quality of the users at the edges of the cells. In addition, after the pilot frequency symbols are modulated and mapped behind the repeating data cell blocks, the receiving terminal can be used for estimating the state of a wireless channel and responding to the channel, thus exactly detecting and demodulating the received signals. The invention also discloses a signal transmission device.
Description
Technical field
The present invention relates to OFDM (OFDM) wireless mobile telecommunication technology, relate in particular to a kind of signaling method and a kind of sender unit.
Background technology
In the future communications system, OFDM (OFDM) technology is widely adopted, the basic fundamental during as system's air interface.
Adopt the process of OFDM technology transmitted signal to comprise:
A, modulate to sent data and to cut apart, generate a plurality of data symbols;
B, a plurality of data symbols that will generate and frequency pilot sign (common pilot symbols or dedicated pilot symbol) modulation are mapped to Physical Resource Block (PRB, Physical Resource Block) appointment time-frequency position, obtain data block corresponding to data to be sent (DB, Data Block);
C, send described data block.
When adopting OFDM technology transmitted signal, channel resource is the structure of a time-frequency two-dimensional, and whole channel resource can be divided into one or more PRB.Fig. 1 is the schematic diagram of PRB, and this PRB has taken the part of whole channel resource.This PRB comprises N in time domain
TIndividual continuous OFDM symbol comprises N at frequency domain
FThe subcarrier of individual continuous quadrature.This PRB comprises N altogether
T* N
FIndividual time-frequency position.
Can find out, when adopting OFDM technology transmitted signal, can adopt the subcarrier of quadratures different in the OFDM symbol to send the data of different user, thereby realize multi-user's multiplexing and multiple access access.
For ofdm system, there is not multiple access interference in the residential quarter.But, under the mode of identical networking, if the user between the neighbor cell will produce interference to each other in identical time-frequency position transmitted signal.Especially at cell edge, other neighbor cell of user distance is nearer, can be more intense from the interference signal of other user in the neighbor cell, so that the user's of cell edge communication quality sharply worsens.
Summary of the invention
In view of this, the technical problem that the present invention solves provides a kind of signaling method, when adopting the OFDM technology to be reduced in, in the interference between the neighbor cell user under the identical networking mode, improves the communication quality of Cell Edge User.
Another technical problem that the present invention will solve provides a kind of sender unit.
For this reason, technical scheme provided by the invention is as follows:
A kind of signaling method comprises:
Be weighted repetitive extension to sent each data symbol, obtain the spread data symbol of each data symbol;
The spread data symbol modulation of each data symbol is mapped to each self-corresponding repetition Resource Block BRB among the same repetition Resource Block group BRBG, to be mapped to the frequency pilot sign modulation that is arranged in same data symbol with described spread data symbol the appointment time-frequency position of described BRB, obtain repeating data cell block corresponding to each data symbol, described repeating data cell block comprises a spread data symbol group and a frequency pilot sign; Wherein, described spread data symbol group is the spread data symbol of organizing each data symbol that is unit;
Send described each repeating data cell block.
Preferably, be weighted repetitive extension by repeat factor RF to sent data symbol.
In certain embodiments, by described RF copy data symbol, and in one group of weighted factor sequence corresponding to described RF, select available weighted factor sequence; Each weighted factor in the selecteed weighted factor sequence and each data symbol that copies acquisition are multiplied each other respectively, so that the data symbol is weighted repetitive extension.
In certain embodiments, described frequency pilot sign is the expansion dedicated pilot symbol.
In certain embodiments, adopt each weighted factor in the described weighted factor sequence to the dedicated pilot symbol weighting repetitive extension, obtain respectively to expand dedicated pilot symbol.
Preferably, copy dedicated pilot symbol by described RF; Adopt each weighted factor in the described weighted factor sequence to multiply each other respectively with each dedicated pilot symbol that copies acquisition, with to the dedicated pilot symbol weighting repetitive extension.
In certain embodiments, further comprise: receiving device after receiving described each repeating data cell block is contrasted the dedicated pilot symbol in wherein each expansion dedicated pilot symbol and the not weighting situation;
Inverse operation obtains dedicated pilot symbol is weighted the weighted factor sequence that repetitive extension adopts.
In certain embodiments, described frequency pilot sign is common pilot symbols.
In certain embodiments, the frequency pilot sign modulation with the neighbor cell user is mapped to nonoverlapping running time-frequency resource position among the BRB.
In certain embodiments, the sequence that adopts of neighbor cell user's frequency pilot sign is orthogonal.
In certain embodiments, the frequency pilot sign modulation that different antennae is sent is mapped to nonoverlapping running time-frequency resource position among the BRB.
In certain embodiments, the sequence that frequency pilot sign adopted that is sent by different antennae is orthogonal.
The present invention also provides a kind of corresponding sender unit, comprising:
The data symbol expanding element is used for being weighted repetitive extension to sent each data symbol, obtains the spread data symbol of each data symbol;
Repeating data cell block unit, the spread data symbol modulation that is used for that the data symbol expanding element is obtained is mapped to same and repeats each self-corresponding repetition of Resource Block group BRBG Resource Block BRB, with will be mapped to the frequency pilot sign modulation that spread data symbol is arranged in same data symbol the appointment time-frequency position of described BRB, obtain repeating data cell block corresponding to each data symbol, wherein, described repeating data unit comprises a spread data symbol group and frequency pilot sign; Wherein, described spread data symbol group is the spread data symbol of organizing each data symbol that is unit; With
Transmitting element is used for sending each repeating data cell block that repeating data cell block unit obtains.
Preferably, the data symbol expanding element is weighted repetitive extension by repeat factor RF to sent data symbol.
In certain embodiments, the data symbol expanding element is pressed described RF copy data symbol, and selects available weighted factor sequence in one group of weighted factor sequence corresponding to described RF; Each weighted factor in the selecteed weighted factor sequence and each data symbol that copies acquisition are multiplied each other respectively, so that the data symbol is weighted repetitive extension.
In certain embodiments, described frequency pilot sign is the expansion dedicated pilot symbol.
In certain embodiments, described device also comprises: frequency pilot sign expanding element, each weighted factor that is used for adopting described weighted factor sequence obtain respectively to expand dedicated pilot symbol to the dedicated pilot symbol weighting repetitive extension.
Preferably, the frequency pilot sign expanding element copies dedicated pilot symbol by described RF; Adopt each weighted factor in the described weighted factor sequence to multiply each other respectively with each dedicated pilot symbol that copies acquisition, with to the dedicated pilot symbol weighting repetitive extension.
In certain embodiments, described frequency pilot sign is common pilot symbols.
In the present invention, by adopting different weighted factor sequences the data of the different user that takies identical time-frequency position are weighted repetitive extension, can obtain different repeating data cell blocks.Under the identical networking mode, when if the user of certain cell edge receives the signal of neighbor cell user transmission, can separate each the repeating data cell block that takies identical time-frequency position according to different weighted factor sequences, thereby reduced the interference between the neighbor cell user, improved the communication quality of Cell Edge User.In addition, after frequency pilot sign modulation is mapped to the repeating data cell block, receiving terminal just can be estimated exactly according to frequency pilot sign wherein state and the channel response of wireless channel, thereby can correctly detect and demodulated received signal after receiving the repeating data cell block.Adopt technical scheme provided by the invention can realize the transmission of the effectively reliable and variable bit rate of information in the radio communication channel, can also realize the multiplexed and multiple access access of radio communication channel resource.The method and application of installation in the wireless mobile cellular system, can be realized identical networking easily, improve capacity and the performance of system.The proposition of the method can solve the allocation schedule of the resource in the radio communication and the Harmonic Control of interference (comprising in the residential quarter and presence of intercell interference) well, thereby has greatly improved power system capacity and performance.
Description of drawings
The schematic diagram of PRB when Fig. 1 is existing employing OFDM technology;
Fig. 2 is the flow chart of the embodiment of the invention 1;
Fig. 3-1a, Fig. 3-1b, Fig. 3-1c, Fig. 3-2a, Fig. 3-2b, Fig. 3-2c, Fig. 3-2d and Fig. 3 the-the 3rd, among the present invention the frequency pilot sign modulation is mapped to the schematic diagram of repeating data cell block;
Fig. 4 is the schematic diagram that among the present invention a MIMO antenna is adopted the scattered pilot design;
Fig. 5 is the schematic diagram of a kind of sender unit provided by the invention.
Embodiment
The thought of " piece repeats the multiple access access " has been proposed in the present invention.It is a kind of new efficient multiple access access scheme that piece repeats the multiple access access scheme.The communication that repeats (BR, Block Repeat) based on piece can be referred to as piece and repeat transmission.The multiplexed piece that can be referred to as that repeats based on piece repeats multiplexing (BRDM, Block Repeat Division Multiplex).The multiple access access that repeats based on piece can be referred to as piece repetition multiple access access (BRDMA, Block Repeat Division Multiple Access).Piece repeats the combination of multiple access access scheme and OFDM, can be referred to as piece and repeat OFDM (BR-OFDM) and piece repetition OFDM access (BR-OFDMA).
For making those skilled in the art understand better the present invention, specify below in conjunction with 1 pair of signaling method provided by the invention of embodiment, Fig. 2 shows the flow process of the method.
In step 21, modulate to sent data and to cut apart, generate each data symbol;
In step 22, each data symbol is weighted repetitive extension, obtain the spread data symbol of each data symbol.
Can be by pre-configured repeat factor (RF, Repeat Factor), the number of times that namely the data symbol is carried out repetition is weighted repetitive extension to sent data symbol.In addition, can be that a repeat factor configures a plurality of weighted factor sequences in advance, described a plurality of weighted factor sequences can be called weighted factor sequence set corresponding to this repeat factor.Described weighted factor sequence also can be called duplication code (RC, Repeat Code) sequence.
In corresponding each the weighted factor sequence of repeat factor, all comprise a described repeat factor weighted factor.Suppose that repeat factor is N, include N weighted factor in each weighted factor sequence that then this repeat factor is corresponding.
When a data symbol M to be sent is weighted repetitive extension, suppose that pre-configured repeat factor is N, then at first according to pre-configured repeat factor, described data symbol M to be sent is copied, obtain N data symbol M to be sent.Then, from the corresponding weighted factor sequence set of this repeat factor, select an available weighted factor sequence.Here so-called available weighted factor sequence refers to, not yet is assigned to other users' weighted factor sequence.
One in weighted factor in the selecteed weighted factor sequence and described N the data symbol to be sent that copies acquisition is multiplied each other, can obtain the data symbol of a weighting.After N weighted factor in the selecteed weighted factor sequence multiplied each other with the described N that copies an acquisition data symbol to be sent respectively, can obtain the data symbol of N weighting, thereby realization is to the weighting repetitive extension of data symbol M to be sent.Wherein, the data symbol of each weighting can be regarded the spread data symbol of data symbol M to be sent as.
Suppose, repeat factor is 4, and 4 included weighted factors of selecteed weighted factor sequence are (C
1, C
2, C
3And C
4).After data symbol M copied, obtain 4 data symbol M; With C
1Multiply each other with a data symbol M, can obtain the first spread data symbol; With C
2Multiply each other with a data symbol M, can obtain the second spread data symbol; With C
3Multiply each other with a data symbol M, can obtain the 3rd spread data symbol; With C
4Multiply each other with a data symbol M, can obtain the 4th spread data symbol.
When data symbol to be sent has when a plurality of, described a plurality of data symbols can be divided into a data symbols.Then, take group as unit, each data symbol in this group of data symbols all is weighted repetitive extension, thereby obtains the spread data symbol of each data symbol take group as unit, be called the spread data symbol group.Each data symbol in the data symbols is weighted the method for repetitive extension, identical with the method that the individual data symbol is weighted repetitive extension, repeat no more here.
After obtaining the spread data symbol of each data symbol, in step 23, spread data symbol and the frequency pilot sign modulation of each data symbol are mapped to each corresponding piece repetition Resource Block (BRB, Block Repeat Resource Block) the appointment time-frequency position in obtains each corresponding repeating data cell block.Then, in step 24, send described each repeating data cell block.
In the BR-OFDM system, BRB is basic physical resource unit, and it comprises a plurality of continuous OFDM symbols in time domain, also comprises the subcarrier of a plurality of continuous quadratures on frequency domain.The size of a BRB should be determined.Several BRB form one group, are called piece and repeat Resource Block group (BRBG, Block repeat Resource Block Group).Each BRB that forms BRBG can be continuous on time domain and/or frequency domain, also can be discontinuous.Each forms BRB continuous BRBG on time domain, can be called the continuous BRBG(of time domain shown in Fig. 3-1); Each forms BRB continuous BRBG on frequency domain, can be called the continuous BRBG(of frequency domain shown in Fig. 3-2).Each forms BRB continuous BRBG all on time-frequency domain, can be called the continuous BRBG(of time-frequency domain shown in Fig. 3-3).
When repeating to modulate, each spread data symbol group of a data symbols should be modulated respectively each BRB that is mapped among the same BRBG, the corresponding BRB of spread data symbol group.Simultaneously, also frequency pilot sign also should be modulated and be mapped among each BRB specific time-frequency position.
Can find out that the BRB quantity that BRBG comprises is the repeat factor of a data symbols.When the scheduling running time-frequency resource, according to the demand of customer service speed and quality, take BRBG as the user assignment running time-frequency resource as unit, can be the one or more BRBG of user assignment.Be the BRBG that different user distributes, its repeat factor can be the same or different.
After the modulation of a spread data symbol group and frequency pilot sign is mapped to a BRB, will obtain a repeating data cell block.Can find out that so-called repeating data cell block refers to, a running time-frequency resource of spread data symbol group and frequency pilot sign has been shone upon in modulation.
Can find out, after frequency pilot sign modulation is mapped to the repeating data cell block, receiving terminal just can be estimated exactly according to frequency pilot sign wherein state and the channel response of wireless channel, thereby can correctly detect and demodulated received signal after receiving the repeating data cell block.
The mode of modulation mapping frequency pilot sign includes but not limited to following several in the repeating data cell block:
A, in the repeating data cell block at least one subcarrier modulation mapping frequency pilot sign of same OFDM symbol, Fig. 3-1a, 3-1b and 3-1c are respectively three schematic diagrames of this mode;
B, in the repeating data cell block the same subcarrier modulation mapping frequency pilot sign of at least one OFMD symbol, Fig. 3-2a, 3-2b, 3-2c and 3-2d are respectively four schematic diagrames of this mode;
C, at the different sub carrier modulation mapping frequency pilot sign of a plurality of OFDM symbols of repeating data cell block, Fig. 3-the 3rd, a schematic diagram of this mode.
Here need to prove, the frequency pilot sign of modulation mapping both can be common pilot symbols in the repeating data cell block, also can be dedicated pilot symbol.
Because common pilot symbols is carried out channel estimating for all users in the residential quarter, therefore needn't be weighted repetitive extension to common pilot symbols.Because dedicated pilot symbol carries out channel estimating for the specific user, therefore should be weighted repetitive extension to dedicated pilot symbol, should be the expansion dedicated pilot symbol of correspondence so modulation is mapped to each repeating data cell block.
The weighted factor sequence that the dedicated pilot symbol weighting repetitive extension is adopted should be the weighted factor sequence that corresponding data symbol adopts.
Suppose, the repeat factor of data symbol M is 4, and 4 included weighted factors of selecteed weighted factor sequence are (C
1, C
2, C
3And C
4), when then dedicated pilot symbol being weighted repetitive extension, also adopt this weighted factor sequence.
At first copy dedicated pilot symbol by described repeat factor, obtain 4 dedicated pilot symbols.With C
1Multiply each other with a dedicated pilot symbol, can obtain the first expansion dedicated pilot symbol; With C
2Multiply each other with a dedicated pilot symbol, can obtain the second expansion dedicated pilot symbol; With C
3Multiply each other with a dedicated pilot symbol, can obtain the 3rd expansion dedicated pilot symbol; With C
4Multiply each other with a dedicated pilot symbol, can obtain the 4th expansion dedicated pilot symbol.
After obtaining four expansion dedicated pilot symbols, the first expansion dedicated pilot symbol and the first spread data symbol are modulated the BRB that is mapped to same correspondence, obtain the first repeating data cell block; The second expansion dedicated pilot symbol and the second spread data symbol are modulated the BRB that is mapped to same correspondence, obtain the second repeating data cell block; The 3rd expansion dedicated pilot symbol and the 3rd spread data symbol are modulated the BRB that is mapped to same correspondence, obtain the 3rd repeating data cell block; The 4th expansion dedicated pilot symbol and the 4th spread data symbol are modulated the BRB that is mapped to same correspondence, obtain quadruple complex data cell block.
When the frequency pilot sign of modulation mapping in the repeating data cell block was common pilot symbols, corresponding transmitted signal was generally downstream signal.
In the situation that send downstream signal, after network side is identified for sending the BRBG and weighted factor sequence of data symbol, can the information of described BRBG, information, pilot configuration information and other relevant control information of weighted factor sequence be prenoticed each UE by broadcasting or control channel, thereby make each UE can receive the repeating data cell block, utilize the common pilot symbols in each repeating data cell block to carry out channel estimating, utilize described weighted factor sequence that the data symbol in each repeating data cell block is weighted merging.
When the frequency pilot sign of modulation mapping in the repeating data cell block was dedicated pilot symbol, corresponding transmitted signal both can be downstream signal, also can be upward signal.
In the situation that send downstream signal, after network side is identified for sending the BRBG and weighted factor sequence of data symbol, the information of described BRBG, information, pilot configuration information and other relevant control information of weighted factor sequence can be prenoticed relevant UE, thereby make described UE can receive the repeating data cell block, utilize the expansion dedicated pilot symbol in each repeating data cell block to carry out channel estimating, utilize described weighted factor sequence that the data symbol in each repeating data cell block is weighted merging.
Described UE also can carry out inverse operation to the expansion dedicated pilot symbol in a plurality of repeating data cell blocks that receive, acquisition is weighted the weighted factor sequence that repetitive extension adopts to dedicated pilot symbol, the weighted factor sequence that namely is used for the weighting repetitive extension data symbol, in this case, network side can not prenoticed UE with described weighted factor sequence.
The process that the UE inverse operation obtains the weighted factor sequence comprises:
The expansion dedicated pilot symbol that receives and the dedicated pilot symbol in the not weighting situation are contrasted, according to obtaining dedicated pilot symbol is weighted the weighted factor sequence that repetitive extension adopts according to as a result inverse operation.
For example, the dedicated pilot symbol of respectively expanding that UE receives is { 1 ,-1,-1,1}, and it is { 1 by the dedicated pilot symbol in the not weighting situation of pilot configuration information acquisition, 1,1,1}, then by obtaining dedicated pilot symbol { 1,1,1 according to, inverse operation, the weighted factor sequence that 1} is weighted repetitive extension is (1,-1 ,-1,1).
It is pointed out that for cell mobile communication systems, the interference between neighbor cell can reduce the performance of system.Therefore in channel estimating, in order to reduce the interference of neighbor cell, be the design of dedicated pilot or the design of public guide frequency all requires careful consideration.During the neighbor cell transmitted signal, can adopt following several mode to modulate the mapping frequency pilot sign, with the phase mutual interference between further reduction neighbor cell.Here said frequency pilot sign both can be that dedicated pilot symbol also can be common pilot symbols.
The Time Division Multiplexing mode:
The frequency pilot sign of two adjacent residential quarters should modulatedly be mapped to different OFDM symbols, because the frequency pilot sign of two residential quarters is not overlapping in time, thereby can keep quadrature, reduces mutual interference.For the OFDM that is taken by other residential quarters number, this residential quarter can utilize this OFDM symbol transmission data.
In order further to reduce the interference to frequency pilot sign, also the transmission of data not, this OFDM symbol is by vacant.
The TDM mode is mainly for block pilot tone and distributing pilot tone and design.
Frequency division multiplexing (FDM) mode:
The modulated subcarrier that is mapped to different quadratures of the frequency pilot sign of two adjacent residential quarters is because the frequency pilot sign of two residential quarters by the frequency domain quadrature, therefore can reduce mutual interference.For the subcarrier that is taken by other residential quarters, this residential quarter can utilize this subcarrier the transmission of data.
In order further to reduce the interference to frequency pilot sign, also the transmission of data not, this subcarrier is by vacant.
The FDM mode is mainly for Comb Pilot and distributing pilot tone and design.
Code division multiplexing (CDM) mode:
Be mapped to identical running time-frequency resource position if the frequency pilot sign of two adjacent residential quarters is modulated, the frequency pilot sign that will cause the minizone is overlapping in synchro system.At this moment, an orthogonal sequence set S={S can be set
1, S
2..., S
k, including k orthogonal sequence, each orthogonal sequence is S
i=[S
I_1, S
I_2..., S
I_m], 1≤i≤k.The pilot frequency sequence of different districts is selected one of them orthogonal sequence S
iMultiply each other, obtain the pilot frequency sequence of a weighting, because S
iThe orthogonality of sequence, the frequency pilot sign of different districts can reduce mutual interference.
Can find out, between neighbor cell, the modulation mapping mode of these three kinds of frequency pilot signs of TDM, FDM and CDM both can only use wherein a kind of, also can be used in combination, and repeated no more here.
In the BR-OFDM system, use frequency pilot sign, also need to consider the situation of many antennas.In present wide-band communication system, in order to increase power system capacity, usually to adopt many antennas to send data, thereby improve the system transmissions ability, the typical application is multiple-input and multiple-output (MIMO) technology.
In the MIMO technology, antenna can be divided into virtual-antenna and physical antenna, and so-called virtual-antenna refers to that receiving terminal need to distinguish the number of antennas of transmitting terminal, and physical antenna refers to the number of transmitting terminal antenna in kind of actual use when sending data.For the data that can send different antennae exactly detect and demodulation, receiving terminal needs to estimate individually transmitting terminal sends data to every virtual-antenna of receiving terminal channel information.Therefore, every virtual-antenna all needs independent pilot tone to distinguish.The pilot tone of its different virtual antenna can adopt TDM, FDM or CDM mode to distinguish.
When adopting the TDM mode to modulate the mapping frequency pilot sign, in the downlink transfer of same residential quarter, every antenna has independent frequency pilot sign, and the frequency pilot sign between antenna is modulated to be mapped in the different OFDM symbols, by the temporal not overlapping orthogonality that keeps.
When adopting the FDM mode to modulate the mapping frequency pilot sign, in the downlink transfer of same residential quarter, every antenna has independent frequency pilot sign, and the frequency pilot sign between antenna is modulated to be mapped to different subcarriers, by the not overlapping orthogonality that keeps on the frequency domain.
When adopting the CDM mode to modulate the mapping frequency pilot sign, in the downlink transfer of same residential quarter, the frequency pilot sign of all antennas is modulated to be mapped to identical running time-frequency resource position, but the frequency pilot sign of each antenna multiplies each other from different orthogonal sequence, can obtain mutually orthogonal frequency pilot sign.The pilot tone of every antenna can be selected one of them orthogonal guide frequency symbol, and the form of dividing by code keeps the quadrature of multi-antenna pilot symbol, thereby so that receiving terminal can come estimating channel information according to the frequency pilot sign of quadrature.
For the BR-OFDM system, under self-contained pilot design mode, if basic unit block can be expressed as N
b=N
Bt* N
Bf, N
BtNumber, N for the OFDM symbol
BfBe the number of subcarrier, then for block pilot design, at N
BtThe every frequency pilot sign that virtual-antenna is corresponding all must be arranged in the individual OFDM symbol; For the Comb Pilot design, then at N
BfThe every frequency pilot sign that virtual-antenna is corresponding all must be arranged in the individual subcarrier; For the distributing pilot design, then at N
BtIndividual OFDM symbol or N
BfThe every frequency pilot sign that virtual-antenna is corresponding is arranged in the individual subcarrier.Frequency pilot sign can adopt TDM, FDM and CDM mode to carry out multiplexing.
Fig. 4 shows the design of one 2 * 2 MIMO employing scattered pilot.BRB shown in Figure 4 comprises 4 OFDM symbols and 4 subcarriers, totally 16 running time-frequency resource positions.Modulate respectively in 16 running time-frequency resource positions of BRB and to have shone upon 4 frequency pilot signs, taken altogether two subcarriers in two OFDM symbols.Pilot frequency character density on the frequency domain is identical with single antenna.Because at two OFDM symbol-modulated mapping frequency pilot signs, therefore, antenna 1 can select frequency pilot sign 1 as its frequency pilot sign, antenna 2 can select frequency pilot sign 2 as its frequency pilot sign.Simultaneously, the frequency pilot sign in two OFDM symbols can be that 2 orthogonal sequence multiplies each other with a length also, distinguishes antenna 1 and antenna 2 by different orthogonal sequences.
Based on above-mentioned signaling method, the invention allows for corresponding sender unit, Fig. 5 is the schematic diagram of this device.This device comprises data symbol expanding element S51, repeating data cell block cell S 52 and transmitting element S53.
Sending ending equipment is modulated to sent data and is cut apart, and behind the generated data symbol, data symbol expanding element S51 will be weighted repetitive extension to sent data symbol, obtain the spread data symbol of each data symbol.
Data symbol expanding element S51 can by pre-configured RF, be weighted repetitive extension to sent data symbol.In addition, can be that a repeat factor configures a plurality of weighted factor sequences in advance, described a plurality of weighted factor sequences can be called weighted factor sequence set corresponding to this repeat factor.Described weighted factor sequence also can be called the RC sequence.
In corresponding each the weighted factor sequence of repeat factor, all comprise a described repeat factor weighted factor.Suppose that repeat factor is N, include N weighted factor in each weighted factor sequence that then this repeat factor is corresponding.
Data symbol expanding element S51 is when being weighted repetitive extension to a data symbol M to be sent, suppose that pre-configured repeat factor is N, then at first according to pre-configured repeat factor, described data symbol M to be sent is copied, obtain N data symbol M to be sent.Then, data symbol expanding element S51 selects an available weighted factor sequence from the corresponding weighted factor sequence set of this repeat factor.Here so-called available weighted factor sequence refers to, not yet is assigned to other users' weighted factor sequence.
Data symbol expanding element S51 multiplies each other one in weighted factor in the selecteed weighted factor sequence and described N the data symbol to be sent that copies acquisition, can obtain the data symbol of a weighting.After N weighted factor in the selecteed weighted factor sequence multiplied each other with the described N that copies an acquisition data symbol to be sent respectively, can obtain the data symbol of N weighting, thereby realization is to the weighting repetitive extension of data symbol M to be sent.Wherein, the data symbol of each weighting can be regarded the spread data symbol of data symbol M to be sent as.
Suppose, repeat factor is 4, and 4 included weighted factors of selecteed weighted factor sequence are (C
1, C
2, C
3And C
4).After data symbol M copied, obtain 4 data symbol M; With C
1Multiply each other with a data symbol M, can obtain the first spread data symbol; With C
2Multiply each other with a data symbol M, can obtain the second spread data symbol; With C
3Multiply each other with a data symbol M, can obtain the 3rd spread data symbol; With C
4Multiply each other with a data symbol M, can obtain the 4th spread data symbol.
When data symbol to be sent has when a plurality of, data symbol expanding element S51 can be divided into a data symbols with described a plurality of data symbols.Then, take group as unit, each data symbol in this group of data symbols all is weighted repetitive extension, thereby obtains the spread data symbol of each data symbol take group as unit, be called the spread data symbol group.Each data symbol in the data symbols is weighted the method for repetitive extension, identical with the method that the individual data symbol is weighted repetitive extension, repeat no more here.
After obtaining the spread data symbol of each data symbol, the spread data symbol of each data symbol that repeating data cell block cell S 52 can obtain data symbol expanding element S51 and frequency pilot sign modulation are mapped to the appointment time-frequency position among each corresponding BRB, obtain each corresponding repeating data cell block.Then, utilize transmitting element S53 to send each repeating data cell block that repeating data cell block cell S 52 obtains.
Here need to prove, repeating data cell block cell S 52 is modulated mapping in the repeating data cell block frequency pilot sign both can be common pilot symbols, also can be dedicated pilot symbol.
Because common pilot symbols is carried out channel estimating for all users in the residential quarter, therefore needn't be weighted repetitive extension to common pilot symbols.Because dedicated pilot symbol carries out channel estimating for the specific user, therefore should be weighted repetitive extension to dedicated pilot symbol, should be the expansion dedicated pilot symbol of correspondence so modulation is mapped to each repeating data cell block.In this case, in device shown in Figure 5, also should comprise a frequency pilot sign expanding element.
The frequency pilot sign expanding element is used for adopting each weighted factor of weighted factor sequence to multiply each other with dedicated pilot symbol respectively, with to the dedicated pilot symbol weighting repetitive extension, obtains respectively to expand dedicated pilot symbol.
The weighted factor sequence that the dedicated pilot symbol weighting repetitive extension is adopted should be the weighted factor sequence that corresponding data symbol adopts.
Suppose, the repeat factor of data symbol M is 4, and 4 included weighted factors of selecteed weighted factor sequence are (C
1, C
2, C
3And C
4), when then dedicated pilot symbol being weighted repetitive extension, also adopt this weighted factor sequence.
The frequency pilot sign expanding element at first copies dedicated pilot symbol by described repeat factor, obtains 4 dedicated pilot symbols.Then, the frequency pilot sign expanding element is with C
1Multiply each other with a dedicated pilot symbol, can obtain the first expansion dedicated pilot symbol; With C
2Multiply each other with a dedicated pilot symbol, can obtain the second expansion dedicated pilot symbol; With C
3Multiply each other with a dedicated pilot symbol, can obtain the 3rd expansion dedicated pilot symbol; With C
4Multiply each other with a dedicated pilot symbol, can obtain the 4th expansion dedicated pilot symbol.
After the frequency pilot sign expanding element obtained four expansion dedicated pilot symbols, repeating data cell block cell S 52 was mapped to the first expansion dedicated pilot symbol and the modulation of the first spread data symbol the BRB of same correspondence, obtains the first repeating data cell block; Repeating data cell block cell S 52 is mapped to the second expansion dedicated pilot symbol and the modulation of the second spread data symbol the BRB of same correspondence, obtains the second repeating data cell block; Repeating data cell block cell S 52 is mapped to the 3rd expansion dedicated pilot symbol and the modulation of the 3rd spread data symbol the BRB of same correspondence, obtains the 3rd repeating data cell block; Repeating data cell block cell S 52 is mapped to the 4th expansion dedicated pilot symbol and the modulation of the 4th spread data symbol the BRB of same correspondence, obtains quadruple complex data cell block.
Can find out, after frequency pilot sign modulation is mapped to the repeating data cell block, receiving terminal just can be estimated exactly according to frequency pilot sign wherein state and the channel response of wireless channel, thereby can correctly detect and demodulated received signal after receiving the repeating data cell block.
The mode of modulation mapping frequency pilot sign includes but not limited to following several in the repeating data cell block:
A, in the repeating data cell block at least one subcarrier modulation mapping frequency pilot sign of same OFDM symbol, Fig. 3-1a, 3-1b and 3-1c are respectively three schematic diagrames of this mode;
B, in the repeating data cell block the same subcarrier modulation mapping frequency pilot sign of at least one OFMD symbol, Fig. 3-2a, 3-2b, 3-2c and 3-2d are respectively four schematic diagrames of this mode;
C, at the different sub carrier modulation mapping frequency pilot sign of a plurality of OFDM symbols of repeating data cell block, Fig. 3-the 3rd, a schematic diagram of this mode.
Can find out, method and apparatus provided by the present invention, both can be used for existing base station (Node B), radio network controller (RNC) or user terminal, base station (eNodeB) and the user terminal that also can be used for evolution scheme, the network equipment that can also be used for some similar base station functions of future communications system, and user terminal.
Those skilled in the art can understand, the various exemplary method step of describing in conjunction with the disclosed embodiments here and device unit all can electronic hardware, software or the combination of the two realize.In order to be clearly shown that the interchangeability between the hardware and software, above various exemplary steps and unit are all carried out generally description with its functional form.This functional be to realize or realize depending on the design constraint that specific application and whole system are realized with software with hardware.Those skilled in the art can be for each specific application, realize in many ways described functional, but the result of this realization should not be construed as and on the contrary deviates from scope of the present invention.
Utilize general processor, digital signal processor (DSP), application-specific integrated circuit (ASIC) (ASIC), field programmable gate array (FPGA) or other programmable logical device, discrete gate or transistor logic, discrete hardware components or the combination in any among them, can realize or carry out the various exemplary unit of describing in conjunction with embodiment disclosed herein.General processor may be microprocessor, but in another kind of situation, this processor may be processor, controller, microcontroller or the state machine of any routine.Processor also may be implemented as the combination of computing equipment, for example, and the combination of DSP and microprocessor, multi-microprocessor, one or more microprocessor or any other this kind structure in conjunction with the DSP core.
In conjunction with the step of the described method of above-mentioned disclosed embodiment can directly be presented as hardware, the software module carried out by processor or the combination of these two.Software module may be present in the storage media of RAM memory, flash memory, ROM memory, eprom memory, eeprom memory, register, hard disk, mobile disk, CD-ROM or any other form well known in the art.The coupling of a kind of exemplary storage medium and processor, thereby so that processor can be from this storage media read message, and can be to this storage media write information.In replacing example, storage media is the part of processor.Processor and storage media may be present among the ASIC.This ASIC may be present in the subscriber station.Replace in the example at one, the discrete assembly that processor and storage media can be used as in the subscriber station exists.
Described disclosed embodiment is provided, can be so that those skilled in the art can realize or use the present invention.To those skilled in the art, the various modifications of these embodiment are apparent, and the general principles of definition here also can be applied to other embodiment on the basis that does not depart from the scope of the present invention with purport.Above-described embodiment only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (15)
1. a signaling method is characterized in that, comprising:
Copy each data symbol to be sent by repeat factor RF, and in one group of weighted factor sequence corresponding to described RF, select available weighted factor sequence, each weighted factor in the selecteed weighted factor sequence and each data symbol that copies acquisition are multiplied each other respectively, to be weighted repetitive extension to sent each data symbol, obtain the spread data symbol of each data symbol;
The spread data symbol modulation of each data symbol is mapped to each self-corresponding repetition Resource Block BRB among the same repetition Resource Block group BRBG, to be mapped to the frequency pilot sign modulation that described spread data symbol is arranged in same data symbol the appointment time-frequency position of described BRB, obtain repeating data cell block corresponding to each data symbol, described repeating data cell block comprises a spread data symbol group and a frequency pilot sign; Wherein, described spread data symbol group is the spread data symbol of organizing each data symbol that is unit;
Send described each repeating data cell block.
2. the method for claim 1 is characterized in that, described frequency pilot sign is the expansion dedicated pilot symbol.
3. method as claimed in claim 2 is characterized in that, adopts each weighted factor in the described weighted factor sequence to the dedicated pilot symbol weighting repetitive extension, obtains respectively to expand dedicated pilot symbol.
4. method as claimed in claim 3 is characterized in that, copies dedicated pilot symbol by described RF;
Adopt each weighted factor in the described weighted factor sequence to multiply each other respectively with each dedicated pilot symbol that copies acquisition, with to the dedicated pilot symbol weighting repetitive extension.
5. method as claimed in claim 3 is characterized in that, further comprises:
Receiving device after receiving described each repeating data cell block is contrasted the dedicated pilot symbol in wherein each expansion dedicated pilot symbol and the not weighting situation;
Inverse operation obtains dedicated pilot symbol is weighted the weighted factor sequence that repetitive extension adopts.
6. the method for claim 1 is characterized in that, described frequency pilot sign is common pilot symbols.
7. such as the described method of claim 1 to 6 any one, it is characterized in that, neighbor cell user's frequency pilot sign is modulated be mapped to nonoverlapping running time-frequency resource position among the BRB.
8. such as the described method of claim 1 to 6 any one, it is characterized in that, the sequence that neighbor cell user's frequency pilot sign adopts is orthogonal.
9. such as the described method of claim 1 to 6 any one, it is characterized in that, the frequency pilot sign modulation that different antennae is sent is mapped to nonoverlapping running time-frequency resource position among the BRB.
10. such as the described method of claim 1 to 6 any one, it is characterized in that, orthogonal by the sequence that frequency pilot sign adopted that different antennae sends.
11. a sender unit is characterized in that, comprising:
The data symbol expanding element, be used for copying each data symbol to be sent by repeat factor RF, and in one group of weighted factor sequence corresponding to described RF, select available weighted factor sequence, each weighted factor in the selecteed weighted factor sequence and each data symbol that copies acquisition are multiplied each other respectively, to be weighted repetitive extension to sent each data symbol, obtain the spread data symbol of each data symbol;
Repeating data cell block unit, the spread data symbol modulation that is used for that the data symbol expanding element is obtained is mapped to same and repeats each self-corresponding repetition of Resource Block group BRBG Resource Block BRB, to be mapped to the frequency pilot sign modulation that spread data symbol is arranged in same data symbol the appointment time-frequency position of described BRB, obtain repeating data cell block corresponding to each data symbol, wherein, described repeating data unit comprises a spread data symbol group and frequency pilot sign; Wherein, described spread data symbol group is the spread data symbol of organizing each data symbol that is unit; With
Transmitting element is used for sending each repeating data cell block that repeating data cell block unit obtains.
12. device as claimed in claim 11 is characterized in that, described frequency pilot sign is the expansion dedicated pilot symbol.
13. device as claimed in claim 12 is characterized in that, also comprises:
Frequency pilot sign expanding element, each weighted factor that is used for adopting described weighted factor sequence obtain respectively to expand dedicated pilot symbol to the dedicated pilot symbol weighting repetitive extension.
14. device as claimed in claim 13 is characterized in that, the frequency pilot sign expanding element copies dedicated pilot symbol by described RF;
Adopt each weighted factor in the described weighted factor sequence to multiply each other respectively with each dedicated pilot symbol that copies acquisition, with to the dedicated pilot symbol weighting repetitive extension.
15. device as claimed in claim 11 is characterized in that, described frequency pilot sign is common pilot symbols.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007101757589A CN101409583B (en) | 2007-10-11 | 2007-10-11 | Method and device for transmitting signal |
| KR1020107009791A KR101125756B1 (en) | 2007-10-11 | 2008-10-07 | A signal transmission method and a device |
| EP08801024.4A EP2211513B1 (en) | 2007-10-11 | 2008-10-07 | A signal transmission method and a device |
| US12/682,444 US8300592B2 (en) | 2007-10-11 | 2008-10-07 | Signal transmission method and device |
| JP2010528265A JP5365963B2 (en) | 2007-10-11 | 2008-10-07 | Signal transmission method and apparatus |
| PCT/CN2008/072610 WO2009049528A1 (en) | 2007-10-11 | 2008-10-07 | A signal transmission method and a device |
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| CN2007101757589A CN101409583B (en) | 2007-10-11 | 2007-10-11 | Method and device for transmitting signal |
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| CN101409583B true CN101409583B (en) | 2013-02-13 |
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| US (1) | US8300592B2 (en) |
| EP (1) | EP2211513B1 (en) |
| JP (1) | JP5365963B2 (en) |
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| JP5365963B2 (en) | 2013-12-11 |
| EP2211513A4 (en) | 2016-01-27 |
| EP2211513B1 (en) | 2018-11-07 |
| WO2009049528A1 (en) | 2009-04-23 |
| JP2011501484A (en) | 2011-01-06 |
| CN101409583A (en) | 2009-04-15 |
| US20100254341A1 (en) | 2010-10-07 |
| US8300592B2 (en) | 2012-10-30 |
| KR20100060028A (en) | 2010-06-04 |
| KR101125756B1 (en) | 2012-03-27 |
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